CONTENTS 



PAGE 



1. Walcott, Charles D. Abrupt appearance of the Cambrian 



Fauna on the North American Continent i 



Published August i8, 1910. Pp. [Title] + 1-16, pi. i, text fig. i. 

 (Pub. No. 1940.) 



2. Walcott, Charles D. Middle Cambrian Merostomata. . . 17 



April 8, 1911. Pp. [Title] -f 17-40, pis. 2-7. (Pub. No. 2009.) 



3. Walcott, Charles D. Middle Cambrian Holothurians and 



Medusae 41 



June 13, 1911. Pp. [Title] +41-68, pis. 8-13, text figs. 2-6. 

 (Pub. No. 201 1.) 



4. Walcott, Charles D. Cambrian Faunas of China 69 



June 17, 1911. Pp. [Title] + 69-108, pis. 14-I/', text figs. 7, 7a. 

 (Pub. No, 2012.) 



5. Walcott, Charles D. Middle Cambrian Annelids 109 



September 4, 191 1. Pp. [Title] -f 109-144, pis. 18-23. (Pub. No. 

 2014.) 



6. Walcott, Charles D. Middle Cambrian Branchiopoda, 



Malacostraca, Trilobita, and Merostomata 145 



March 13, 1912. Pp. [Title] + 145-228, pis. 24-34, text figs. 8-10. 

 (Pub. No. 2051.) 



7. Walcott, Charles D. Cambro-Ordovician Boundary in 



British Columbia with Description of Fossils 229 



March 8, 1912. Pp. [Title] +229-237, pi, 35. (Pub. No. 2075.) 



8. Walcott, Charles D. The Sardinian Cambrian Genus 



Olenopsis in America 239 



March 8, 1912. Pp. [Title] +239-249, pi. 36. (Pub. No. 2076.) 



9. Walcott, Charles D. New York Potsdam-Hoyt Fauna. . 251 



September 14, 1912. Pp. [Title] + 251-304, pis. 37-40- (Pub. 

 No. 2136.) 



10. Walcott, Charles D. Group Terms for the Lower and 



Upper Cambrian Series of Formations 305 



September 16, 1912. Pp. [Title] +305-307. (Pub. No. 2137.) 



11, Walcott, Charles D. New Lower Cambrian Sub fauna. . 309 



July 21, 1913. Pp. [Title] + 309-326, pis. 50-54. (Pub. No. 

 2185.) 



(v) 



